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Googlebot 2.1 User-Agent String

Googlebot 2.1

User-Agent NameGooglebot 2.1
User-Agent URL
CategoryRobot, Spider, Crawler
OrganizationGoogle Inc.
Total Strings1
Last VisitFeb 02, 2013 21:53 PST

All user-agent string from Googlebot 2.1

#User-Agent StringVisit FrequencyLast VisitView
1Mozilla/5.0 (compatible; Googlebot/2.1; + 02, 2013 21:53 PSTView Detail

The description about Googlebot 2.1

A Googlebot is a search bot used by Google. It collects documents from the web to build a searchable index for the Google search engine.

If a webmaster wishes to restrict the information on their site available to a Googlebot, or another well-behaved spider, they can do so with the appropriate directives in a robots.txt file,[1] or by adding the meta tag to the webpage. [2] Googlebot requests to Web servers are identifiable by a user-agent string containing "Googlebot" and a host address containing "".

Verifying Googlebot

You can verify that a bot accessing your server really is Googlebot by using a reverse DNS lookup, verifying that the name is in the domain, and then doing a forward DNS lookup using that googlebot name. This is useful if you're concerned that spammers or other troublemakers are accessing your site while claiming to be Googlebot.

For example:

> host domain name pointer 

> host has address

Google doesn't post a public list of IP addresses for webmasters to whitelist. This is because these IP address ranges can change, causing problems for any webmasters who have hard coded them. The best way to identify accesses by Googlebot is to use the user-agent (Googlebot)